数字农科院2.0

The Sinocyclocheilus cavefish genome provides insights into cave adaptation

文献类型： 外文期刊

作者： Yang, Junxing;Jiang, Wansheng;Pan, Xiaofu;Wang, Xiaoai;Chen, Xiaoyong;Zheng, Lanping;Chen, Xiaoli;Bai, Jie;Fang, Dongming;Qiu, Ying;Yuan, Hui;Bian, Chao;Lu, Jiang;He, Shiyang;Zhang, Yaolei;You, Xinxin;Wang, Yongsi;Sun, Ying;Mao, Danqing;Liu, Yong;Fan, Guangyi;Zhang, He;Zhang, Xinhui;Wang, Jintu;Chen, Jieming;Ruan, Zhiqiang;Li, Jia;Yu, Hui;Peng, Chao;Wang, Jian;Yang, Huanming;Wang, Jun;Xu, Xun;Bai, Jie;Qiu, Ying;Bian, Chao;You, Xinxin;Zhang, Xinhui;Chen, Jieming;Ruan, Zhiqiang;Li, Jia;Yu, Hui;Peng, Chao;Bai, Jie;Whitten, Tony;Qiu, Ying;Sun, Ying;Cheng, Le;Fang, Dongming;Lu, Jiang;He, Shiyang;Li, Jia;Yu, Hui;Zhang, Yaolei;Cheng, Le;Ma, Xingyu;Xu, Junmin;Shi, Qiong;Ma, Xingyu;Xu, Junmin;Shi, Qiong;He, You;Xu, Zhengfeng;Xu, Pao;Wang, Jian;Yang, Huanming;Wang, Jun

作者机构：

关键词： Cavefish;Genome;Adaptation;Evolution;Qinghai-Tibetan Plateau;Sinocyclocheilus

期刊名称： BMC BIOLOGY

ISSN： 1741-7007

年卷期： 2016 年 14 卷

页码：

收录情况： SCI

摘要： Background: An emerging cavefish model, the cyprinid genus Sinocyclocheilus, is endemic to the massive southwestern karst area adjacent to the Qinghai-Tibetan Plateau of China. In order to understand whether orogeny influenced the evolution of these species, and how genomes change under isolation, especially in subterranean habitats, we performed whole-genome sequencing and comparative analyses of three species in this genus, S. grahami, S. rhinocerous and S. anshuiensis. These species are surface-dwelling, semi-cave-dwelling and cave-restricted, respectively. Results: The assembled genome sizes of S. grahami, S. rhinocerous and S. anshuiensis are 1.75 Gb, 1.73 Gb and 1.68 Gb, respectively. Divergence time and population history analyses of these species reveal that their speciation and population dynamics are correlated with the different stages of uplifting of the Qinghai-Tibetan Plateau. We carried out comparative analyses of these genomes and found that many genetic changes, such as gene loss (e.g. opsin genes), pseudogenes (e.g. crystallin genes), mutations (e.g. melanogenesis-related genes), deletions (e.g. scale-related genes) and down-regulation (e.g. circadian rhythm pathway genes), are possibly associated with the regressive features (such as eye degeneration, albinism, rudimentary scales and lack of circadian rhythms), and that some gene expansion (e.g. taste-related transcription factor gene) may point to the constructive features (such as enhanced taste buds) which evolved in these cave fishes. Conclusion: As the first report on cavefish genomes among distinct species in Sinocyclocheilus, our work provides not only insights into genetic mechanisms of cave adaptation, but also represents a fundamental resource for a better understanding of cavefish biology.

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